INVESTIGATION RHEOLOGICAL PROPERTIES OF PVC-BASED

Abstract

Summary. Obtained hydrophobic filler compositions based on PVC from calcium carbonate, which is a byproduct in the preparation of mineral nitrogen fertilizers. The methods for pretreatment of the chalk used as a filler in PVC compositions. Conducted modifying the properties of chalk with hydrophobic additives: stearic acid, zinc stearate, calcium stearate. When stearic acid treated chalk heating leads to an interaction with the surface layers of calcium carbonate, a thin film of calcium stearate. Therefore, more cost-effective to create compositions with PVC content of one percent of calcium stearate as its hydrophobic surface is easily wetted by the polymer matrix, which provides rapid mixing of PVC compounds. As a result, the excipient serves as an additional stabilizer, providing higher thermal stability of PVC products, compared with its values for the composition of the compared with the other ingredients. Extrusion processes that are central to the processing of PVC compounds filled by acting them filler, fractional increase heat and accelerate melting and increase output. The rheological properties of polymeric compositions created PVC. A significant reduction in viscosity observed for water repellent based on stearic acid. Study viscosity characteristics for hydrophobic additives showed that their activity increased in the series: zinc stearate, calcium stearate, stearic acid. It was established that modifying additives used in the preparation of hydrophobic carbonate filler PVC compositions exhibit both plasticizers and stabilizing properties.